Re: [nhc-users] pointers < 2^31?

Am I confused or does nhc98 assume that all pointers are < 2^31?

It would seem that you are right. The top bit 0x10000000 is the ZAP_BIT, used to indicate a black-hole (a value already under evaluation, useful for detecting infinite loops).

On m68k malloc is giving me stuff above 0xc0000000 and I get a segfault the first time mutator.c:460 if(GET_TAG(nodeptr) & VAP_TAG && !CINFO_NEED(GET_CINFO(nodeptr))) { is reached.

Yes, by a horrendous series of CPP macros, GET_CINFO(p) -> EXT_CINFO(*p) -> EXT_FINFO(*p) -> EXT_HADDRESS(*p) -> ~ZAP_BIT & *p the address is being masked. Regards, Malcolm